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    <title>progress、meter和mark标签</title>
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    <p>超文本标记语言（<mark>HTML</mark>）的第五次重大修改。</p>
    <p>硬盘存储占用<meter value="80" max="100" min="0"></meter>GB</p>
    <p>硬盘存储占用<meter value="80" max="100" min="0" low="20" high="70" optimum="60"></meter>GB</p>
    <p>当前任务完成进度：<progress max="100" value="50"></progress></p>
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